Sgt. Jasen Sumner, a tank crewman assigned to Company D, 3rd Battalion, 69th Armor Regiment, 1st Advise and Assist Brigade, 3rd Infantry Division, explains a preventive maintenance and services check on the M1A1 Abram's Tank during a U.S. forces-led joint in-depth tank refresher course, being taught at Joint Security Station Al Rashid. Iraqi Army soldiers Sgt. Hussein Falh, left, and Capt. Muhned Khlid Ahmed participate in the training.